what causes paint cracking ??
Thread Starter
Pro
Joined: Nov 2012
Posts: 672
Likes: 0
From: Chesapeake Virginia
what causes paint cracking ??
Hey guys,
I've been paying a lot more attention to the paint jobs on some of the "show" cars I've seen lately, I've noticed that there are quite a few that have some pretty extensive "cracking" going on. It's not really noticable until you get right up on the cars then you can see it, very fine cracks. I've seen them in single stage paints and base/clear where just the base is cracked.
my thought is it has to do with what temperature the body was when painted, if the panels were cold (shrunken) when painted then expanded as they warmed up the paint may not "stretch" enough to stop the cracking.
I've been paying a lot more attention to the paint jobs on some of the "show" cars I've seen lately, I've noticed that there are quite a few that have some pretty extensive "cracking" going on. It's not really noticable until you get right up on the cars then you can see it, very fine cracks. I've seen them in single stage paints and base/clear where just the base is cracked.
my thought is it has to do with what temperature the body was when painted, if the panels were cold (shrunken) when painted then expanded as they warmed up the paint may not "stretch" enough to stop the cracking.
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,753
From: Charlotte NC
Trapped solvents can cause cracking...mainly in lacquer....due to excessive heavy coats without a sufficient amount of dry time between coats.
Applying WAX over the paint before it has had a good time to cure.
Sloppy repairs and painting over a bad surface "thinking" that the primer they used will hold thing down and prevent cracking....YEAH---RIGHT!!!
Someone who thinks they are a chemist creates a "cocktail" of different layers of products not actually knowing what will happen in the future.
DUB
Applying WAX over the paint before it has had a good time to cure.
Sloppy repairs and painting over a bad surface "thinking" that the primer they used will hold thing down and prevent cracking....YEAH---RIGHT!!!
Someone who thinks they are a chemist creates a "cocktail" of different layers of products not actually knowing what will happen in the future.
DUB
